PSY 290 EXAM 1 PRACTICE QUESTIONS AND ANSWERS GUARANTEED A+
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Course
PSY 290
Institution
PSY 290
PSY 290 EXAM 1 PRACTICE QUESTIONS AND
ANSWERS GUARANTEED A+
Why does myelin increase the speed of conduction? - Myelin
increases the speed of conduction because it
offers considerable resistance to the flow of ionic current
Autism - Understanding how the brain is formed and the way in whi...
Why does myelin increase the speed of conduction? - ✔✔Myelin
increases the speed of conduction because it
offers considerable resistance to the flow of ionic current
Autism - ✔✔Understanding how the brain is formed and the way in which
this process can go wrong
Gastrulation has 2 process - ✔✔-The distinct cellular layer
-Elongation of the form
Gastrulation - ✔✔-It consisted of 3 layers of cells
-Form tissues
-Ectoderm: skin, hair, eye and after the brain
-Mesoderm: aids production of red blood cells, muscles,
-Endoderm: form stomach, liver, lunges, intestine (organs)
Early development of the nervous systems - ✔✔Thickening of the
ectoderm leads to the development of the neural plate
,After 20 days
The neural groove begins to develop and create neural tube
at 20 days
The most lateral row gives rise to sensory neurons.
The middle row gives rise to interneurons.
The medial row gives rise to primary motor neurons.
Day 22
The neural groove come together to form the neural tube
Crest of the neural groove come together to form the neural tube
Day 25
Major divisions of the brain present
Dyslexia, autism, epilepsy and schizophrenia when the process of mutation
of gene occurs
Where some neuron may end up where it should not be
It can cause misplace or oddly formed neurons
,The development of the nervous system can be divided into 6 distinct
stages - ✔✔1. Cells of the neural tube divide to provide progeny cells
2. The cells migrate to their appropriate regions
3. Each cell differentiates, expressing a particular subset of genes to
become a particular type of neuron or glial cells
4.Neuron extend their axons and dendrites and form many synapses with
on another
5.Many neurons normally die early in development
6.Many of the synapses initially formed
-Then will later be retracted
-While other, later-appearing synapses form
Neurogenesis - ✔✔-Embryonic stem cells
-Totipotent (early) - Become any type of body cell
-Multipotent (later) - limited to become a range of what they can become
Cell migration - ✔✔-Once cells have been created they migrate
, - There are 2 different ways to migrate
-2 methods of migration
Chemical signals
-Somal translocation : an extension develops that leads migration; the cell
body follows
-Chemical signal help guide the neurons to final location
-F-actin (red) and microtubule (green) labeling of the same growth cone
Glial
- Mediated migration: The cells moves along a radial glial network
Differentiation - ✔✔Cells sort themselves out through cell interaction
based on what the neighbour cells are doing
-Where they mock what the other cells around them are doing
After migration, cell align themselves with others cells and form structures
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